Stereoselective formation of 1,2-diiodoalkenes and their application in the stereoselective synthesis of highly functionalised alkenes via Suzuki and Stille coupling reactions
Iron(III) Chloride-Catalyzed Tandem Aza-Prins/Friedel-Crafts Cyclization of 2-Arylethyl-2,3-butadienyl Tosylamides and Aldehydes-An Efficient Synthesis of Benzo[<i>f</i>]isoquinolines
作者:Weilong Lin、Jiajia Cheng、Shengming Ma
DOI:10.1002/adsc.201600107
日期:2016.6.16
An efficient approach for the synthesis of 1,2,3,4,5,6‐hexahydrobenzo[f]isoquinolines via a tandem aza‐Prins/Friedel–Crafts cyclization from 2‐arylethyl‐2,3‐butadienyl tosylamides and aldehydes has been developed. This iron(III) chloride‐catalyzed cascade cyclization at the room temperature with different types of aldehydes, such as aromatic and heteroaromatic aldehydes, alkyl aldehydes, and α,β‐unsaturated
一种有效的方法是通过 串联的aza-Prins / Friedel-Crafts环合反应由2-芳基乙基-2-3,3-丁二烯基甲苯磺酰胺和醛合成1,2,3,4,5,6-六氢苯并[ f ]异喹啉。发达。这种氯化铁(III)在室温下与不同类型的醛(例如芳族和杂芳族醛,烷基醛和α,β-不饱和醛)催化的级联环化反应,可提供中等至优异收率的产品(最高97 %)。在该反应中,使用三甲基氯硅烷活化醛。廉价的催化剂,温和的反应条件和广泛的底物范围使该方法非常有用。
Short and efficient route toward α-substituted N-arylazetidines from acetanilides via Mitsunobu reaction
N-Arylazetidines are efficiently obtained in a three-step procedure, providing a wide diversity of derivatives on multigram scale with overall yields of 21–55%. Cheap or easily available acetanilides are used in an adapted aldolization with aldehydes, furnishing β-hydroxyamides with an 81% average yield over 21 examples. Special Mitsunobu conditions have been developed to ensure the cyclization of
Selenium in Organic Synthesis: A Novel Route to 1-Phenylselenobutadienes and 1,4-Dicarbonyl Compounds
作者:J. V. Comasseto、C. A. Brandt
DOI:10.1055/s-1987-27865
日期:——
Two approaches to 1-phenylseleno-1,3-butadienes 5 are reported, via phenylselenoalkenylidene phosphoranes and phenylselenoalkenals, respectively. 1,4-Dicarbonyl compounds are prepared from the 1-phenylselenobutadienes or from the phenylselenoalkenals.
Triphenylphosphine Oxide-Catalyzed Selective α,β-Reduction of Conjugated Polyunsaturated Ketones
作者:Xuanshu Xia、Zhiqi Lao、Patrick Toy
DOI:10.1055/s-0037-1611537
日期:2019.6
remained unchanged. This reaction was applied to a large variety of conjugated dienones, a trienone, and a tetraenone. Additionally, a tandem one-pot Wittig/conjugate-reduction reaction sequence was developed to produce γ,δ-unsaturated ketones directly from simple building blocks. In these reactions the byproduct of the Wittigreaction served as the catalyst for the reduction reaction. This strategy was
A Simple, Mild and General Oxidation of Alcohols to Aldehydes or Ketones by SO
<sub>2</sub>
F
<sub>2</sub>
/K
<sub>2</sub>
CO
<sub>3</sub>
Using DMSO as Solvent and Oxidant
作者:Gao‐Feng Zha、Wan‐Yin Fang、Jing Leng、Hua‐Li Qin
DOI:10.1002/adsc.201900104
日期:2019.5.14
A practical, general and mild oxidation of primary and secondary alcohols to carbonyl compounds proceeds in yields of up to 99% using SO2F2 as electrophile in DMSO as both the oxidant and the solvent at ambient temperature. No moisture‐ and oxygen‐free conditions are required. Stoichiometric amount of inexpensive K2CO3, which generates easy to separate by‐products, is used as the base. Thus, 5‐gram
在环境温度下,使用SO 2 F 2作为亲电子试剂在DMSO中作为氧化剂和溶剂,伯醇和仲醇进行实用,通用且温和的氧化成羰基化合物的收率可达99%。不需要无湿气和无氧条件。化学计量的廉价K 2 CO 3生成易于分离的副产物的油基用作基础。因此,通过简单的过滤作为后处理,以几乎定量的产量进行了5克规模的运行。还应注意使用通常促进竞争的Pummerer重排的极性溶剂(例如DMSO)。该协议与(杂)芳烃,烯烃和炔烃底物上的各种常见的N-,O-和S-官能团兼容(68个例子)。该方案被应用(99%的产率)用于重要的降胆固醇药物瑞舒伐他汀的正式合成。